Knife block



FIG. 1 is a top front perspective view of a knife block showing the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the opposite side being a mirror image of that shown;

FIG. 4 is a rear elevational vivew thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a knife block, as shown and described. 